Shearhead assemblies on electrical and mechanical shavers



Dec. 24, 1968 KQBLER 3,417,467

SHEARHEAD ASSEMBLIES ON ELECTRICAL AND MECHANICAL SHAVERS Filed April 26, 1967 Illllllilllllllllllilll;

INVENTOR PAUL KOBLER United States Patent 3,417,467 SHEARHEAD ASSEMBLIES ON ELECTRICAL AND MECHANICAL SHAVERS Paul Kobler, 81 Fenimore St., Lynbrook, N.Y. 11563 Filed Apr. 26, 1967, Ser. No. 633,990 1 Claim. (Cl. 30-342) ABSTRACT OF THE DISCLOSURE A dry shaver having a plurality of shearheads of different configuration, one with a straight cutting surface, the middle head having a curved cutting surface and the third shearhead also with a curved cutting surface and a more acute curvature than the middle head.

The present invention relates to achieving a different skin stretching effect by a combination of lengthwise differently shaped shearheads.

Such shearheads comprise a hollow outer member and an inner cutter member located within said outer member and movable relative thereto. More particularly this invention relates to a plurality of shearheads attached to an electric or mechanical shaver, the cutting surface of at least two of said shearheads, adjoining each other, being lengthwise of different shape. One of said shearheads may have a straight cutting surface on a horizontal plane while the adjoining head may have, also lengthwise like the first head, a curved cutting surface. A third shearhead, [between the two just mentioned heads may have a lengthwise curvature of a greater radius. As well known in the art, it is desirable that the skin is stretched whilethe cutting surfaces of the heads out the stubble. It is well known that the Kobler shaverheads are lengthwisecurved. The radius of said curvature is about 3% inches. If the first shearhead on the shaver has that lengthwise curvature the next adjoining head is curved in a bigger radius with the result that that head is not quite as high as the first shearhead. The third head on the shaver, adjoining that head with the smaller curvature shows instead of a curved horizontal straight cutting surf-ace.

Such a combination of heads on a shaver stretches the skin in a new and unexpected different way.

Other objects and advantages of this invention will become apparent from the description now to follow of the preferred embodiment thereof, in which reference will be had to the accompanying drawings, in which:

FIG. 1 is a front view, showing the different shapes of the shearheads and also the different construction of their cutting surfaces.

FIG, 2 is a view taken at an angle between a top and side view of said shearheads, showing the shape of the top lines of said heads.

FIG. 3 shows a straight line cutting surface of a shearhead when such a head has passed over a skin pore during the shaving process.

FIG. 4 shows a lengthwise curved cutting surface of a shearhead when such a head has passed over a skin pore during the shaving process.

FIG. 5 shows the shape of a skin pore, stretched by moving a shearhead over it, back and forth.

FIG. 6 shows two differently shaped shearheads, one marked a the other marked b.

FIG. 7 is a front assembly of a shaver with lengthwise differently shaped heads and different constructions of their different cutting surfaces.

FIG. 8 is a top view of a shaver head assembly with two differently shaped shearheads with different cutting surfaces, heads attached in V shape.

The invention may be applied to or incorporated in razors electrically, spring, battery or hand driven, of

various specific shapes and types, it being particularly effective and advantageous in a razor of the character shown in the drawings, which comprises in FIG. 1 a main body portion 1, having shaving heads 2, 3 and 4 removably mounted thereon in a manner common in such razors. A bottom plate 5 may be attached to the body portion 1 of the shearheads. Within the outer stationary shearhead member or shaving heads 2, 3 and 4 is a mova'ble cutter, not shown in the drawings.

We also see in FIG. 1 that shearheads 2, 3 and 4 are differently shaped on top. The cutting surfaces are either roof shaped, the roof shape in different pitches, or round as seen on head 4. The roof shaped cutting surfaces have crosswise cutting bars with slots between them and the head 4 has instead of cutting bars a series of small open ing with cutting edges. When the shaver is moved with head 4 advancing, the skin glides first over the cutting openings of a straight cutting surface. Then the skin is lifted a little higher up by the following head 3-. After head 3 the skin is still lifted higher up by the following head 2. The skin is entirely differently stretched when it goes first over a straight and afterwards over a curved cutting surface. The fundamental idea is, that from a straight line into a curved line the effect on the pores of the skin will be new and, also increased or decreased according to the height of the roof shaped, curved heads. The shearhead with a greater radius in its curvature providing a smaller arc than the are formed by the radius of the curvature of the next adjacent lengthwise curved shearhead.

This effect, an entirely unexpected result, will be described later.

In FIG. 2 the side view of the heads 2, 3 and 4 show even better the straight cutting line of head 4, that is the straight top line, lengthwise, of head 4 and the differently lengthwise curved top lines of heads 2 and 3. By just looking at FIG. 2 we can imagine how the skin is stretched from head 4 to head 3 and again differently from head 3 to head 2.

The main body portion 1 of the shaver in FIG. 2 has a little different shape from the body portion 1 seen in FIG. 1. However this is irrelevant to the invention.

FIG. 3 shows the top line of a straight cutting surface of a head 7, in a position where it has moved over an enlarged pore 8. 9 is the stubble in the middle of the enlarged pore. The skin pore is designed much enlarged to show better the effect of this invention.

FIG. 4 shows the top line 10 of a curved cutting surface of a shearhead 11, in a position where it has moved over an enlarged skin pore, 12. Here too the skin pore is designed much enlarged to show better the effect of this invention.

FIG. 5 shows an enlarged skin pore 13 with stubble 14 in its middle and the stretched part 15 of the skin pore, by moving with the shearhead 4 back and forth over the skin.

In FIG. 6 we see two differently shaped heads a and b which refer to the shapes of the heads seen in FIG. 7.

Speaking of differently shaped shearheads, it would be of course in the spirit of the same invention if one of the heads with a straight top cutting surface would have that cutting surface entirely flat and provided with cutting bars or openings for cutting the stubble, or a combination of different cutting openings on the shearhead.

FIG. 8 shows two differently shaped shearheads arranged in a V shape on the top plate 5 of a shaverbody 1.

Entirely new is the present invention where a combination of straight line shearheads with their straight cutting surfaces is placed next to a lengthwise curved shearhead with a curved cutting surface. The unexpected result with such a combination of shearheads on the shaver is an entirely new stretching effect on the skin. It is again changed if another lengthwise curved shearhead with a bigger radius in its curvature, is following the straightline shearhead with a straight cutting surface.

In operation of this invention we have to consider the effect of above mentioned combination of heads on the pores of the human skin.

For this purpose let us look at FIG. 3. We know that each stubble has a tiny opening around it in the skin, which opening is filled with sebum that is the name of the oil which is put there by nature. For better understanding these skin pores have been greatly enlarged in FIGS. 3, 4 and 5. In their size they are by far too big compared with the heads indicated by numbers 7 and 11 in FIGS. 3 and 4 respectively.

In the shaving operation the stretching of these pores, FIG. 3 number 8, FIG. 4 number 12 and FIG. 5 number 13, is most important in order that the cutting means of the shearheads may penetrate deeper into the skin and cut the stubble closer to its root.

We see in FIGURES 3, 4 and 5 that the opening around a stubble, 8, 12 and 13 changes its shape when the top line of a shearhead cutting surface goes over it. Because when shaving, the shearhead is pressed lightly into the skin. When the shearhead is moved towards c indicated by an arrow next to FIG. 3, the round opening 8 changes its shape into an elongated opening 16 and with the reverse motion of the shaver head towards d the round opening 8 changes its shape 8 into an elongated opening 17. The changing of the round opening into an elongated opening is the result of all motions with shearheads with a straight top line on the cutting surface.

This stretching of the elongated openings however has the disadvantage that the sides of the opening go together in the middle, as seen in FIG. 5. And with further stretching the sides go so far together that they hold the beard stubble with the stretched sides, like in a vise. This prevents the cutting surface of the shearheads to penetrate nearer to the roots of the stubble.

The shearhead indicated in FIG. 4 by a body 11 and a top line of the cutting surface indicated with 10, the stretching of the middle opening 12 also occurs sideways. This sideways stretching is caused by the lengthwise curvature of the shearhead. The stretching of the middle opening 12 in FIG. 4 is therefore from e to f and also from g to It. And this simultaneous sideways stretching from g to It does not permit the sides of the openings to go so much together that they can hold the stubble like in a vise. Therefore the cutting surface of the shearhead can penetrate and cut the stubble nearer to the root. The end result is a closer shave.

Now We come to the unexpected result in the present invention. If We compare FIG. 3 and FIG. 4 We see that the stretching of the inner openings 8 and 12 have changed their shape. Therefore if at least one of the shearheads mounted on a shaver has a straight top line on its cutting surface and the adjoining head has a curved top line on its cutting surface, the stretching of the skin pores changes from one design seen in FIG. 3 into the other design seen in FIG. 4, with each motion of the shaver over the skin of the face, be this a forward or a backward motion of the whole shaver.

In other words when the shaver is in motion over the skin the skin pores change constantly their shapes, as if they would be breathing. This unusual activity of the skin MYRON C.

pores keeps them very flexible wherewith the hardening of the skin surface is greatly prevented. Because in a hard top surface of the skin the cutting surface of the shearhead cannot penetrate nearer the roots of the stubble and a close shave is almost impossible, unless the whole cutting surface is pressed much harder into the skin, which gradually makes the skin a calloused skin. And it may with the time get as hard as a rock. We observe the etfect of a calloused skin on our feet when through hard rubbing of the shoes callouses develop. This shows the importance of the present invention.

We see in FIG. 2 that the middle of the top line of each shearhead changes its height from 17 to 18 and from 18 to 19 for the third shearhead. It is obvious that when the middle head 3 in FIG. 2 has less curvature than head 2 in FIG. 2 the stretching of the skin pores is more gradual and more agreeable in sensation.

In order to avoid a too sudden change of the shape of the skin, there should be a shearhead with less curvature between the head with a straight top line and the last head with the highest curvature on the top line of the cutting surface.

The shape of the skin pores are changed with the straight head into forward and backwards directions and with the same motion of the shaver also by the adjoining curved shearhead into additional sideways directions. The result is therefore with each motion of the shaver a breathing motion of the skin pores, expanding the pores with one motion of the shaver first in one direction, that is forward, and then sideways on both sides, by the other shearhead.

Having thus described the invention, what I desire to claim is:

1. A dry shaver having a plurality of shearheads, one of said shearheads having a lengthwise horizontal cutting surface and the other shearheads having lengthwise curved cutting surfaces, the lengthwise curved shearhead adjacent the shearhead with the horizontal cutting surface, having an increased greater radius in its curvature providing a smaller arc than the arc for-med by the radius of the curvature of the next adjacent lengthwise curved shearhead, each cutting surface being at a different level relative to each other, whereby the skin is lifted gradually and stretched in two directions from the shearhead with the horizontal cutting surface to the last shearhead with the acute lengthwise arc curvature, with each motion of the shaver over the skin, each shearhead is provided with a cooperating reciprocating inner cutter.

References Cited UNITED STATES PATENTS KRUSE, Primary Examiner.

US. Cl. X.R. 30-346.51 

